A device which controls the voltage and current being delivered to a capacitor or battery.

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9 views

Should I connect solar panels in series or parallel for my charger?

I am making a solar charger for 3 AA batteries. I have two 6 volt 100mah solar panels. Will it be more beneficial to connect them in parallel to have more current or in series to increase the voltage? ...
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3answers
68 views

I want to decrease the voltage on my electric fence charger [on hold]

I just installed a small electric fence in my backyard to keep my small dogs from clawing through the wood fence to get to the neighbors dogs. ...
3
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1answer
53 views

How does a battery balance and protection circuit work?

I am building a 4S LiPo battery pack that I would like to incorporate in a portable speaker project and I need to make sure the batteries will never require maintenance beside replacing them ...
2
votes
2answers
84 views

Charging time of lithium ion batteries

I am charging a 430mAh lithium polymer battery at 1C using BQ24232 charger IC (from Texas instruments). The charge terminates within 1 hour 20 min with battery voltage showing 4.17V. On research I ...
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1answer
50 views

Building a USB Charging Circuit Using 120VAC

first time here. I've been working on developing a 3-port USB charging circuit coming out of a 120VAC wall outlet. Here is a basic schematic of what I'm following. I've been having some trouble ...
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0answers
41 views

Maximum voltage through a connector with magnets [closed]

I have two questions about the implementation of magnets with electricity. What is the maximum allowed voltage through this method ( see pictures ) That way isolate the positive and the negative in ...
0
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1answer
29 views

Problem in circuit that charges tablet/cell phone via Micro-USB port

I am trying to design a circuit that can charge tablet/cell phone via micro-usb port. Attached is the circuit I put together. The basic idea is, take 6 ~ 12V DC from an AC-adapter, then step the ...
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1answer
43 views

DIY 18650 charge pack questions

I've tried searching through existing topics but haven't found an answer. I'm a beginner enthusiast. I have a couple of questions that I would appreciate input for. My plan is to make a battery ...
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4answers
73 views

Why is a cellphone charger rated like that?

Here is what I read on the nameplate of my phone charger: Output 5V DC 1A. So, I think the Max. Output power is 5 watts. Input: 100-240 AC 50/60Hz 200mA. I assume that the mains voltage is 100 ...
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1answer
49 views

LiPo charging circuit

I'm using a 6s Lithium Polymer battery in one of my projects, and I'd like to make it more consumer friendly. This means that I should probably get rid of the need for a balance charger (which few ...
0
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1answer
31 views

Multiple Wireless charging coils (Qi) in parallel?

I am making a device that will be wireleslly charged and I decided to go for a standardized Qi transmitter/receiver. The device is a kind of bulk and I want it to have an option to get charged no ...
0
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3answers
58 views

Looking an IC chip to charge cell phone [duplicate]

I have a DC voltage source (between 5 and 10V) from which I want to charge cell phone with a USB cable. I believe that using a LM317 or similar IC for charging cell phones is not a good idea as most ...
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2answers
67 views

Diode oring and charger

I am trying to setup a schottky diode oring circuit to switch between my battery and a dc power supply. I am dealing with some pretty high amperages and a liPo battery, so I need to make sure I get ...
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2answers
43 views

Test car phone charger amperage [closed]

I have at car usb charger. It has 2 ports and is rated 2.1A when one port is used and 1A when both ports are used. I attached samsung tablet (N8000) witch requires 2A output. So, tablet isn't ...
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votes
1answer
86 views

Charging a 3.7 V with a 5V usb charger [closed]

For a project, I want to charge a lipo battery (3.7V @2000mah) with a 5V USB charger. I'm not into electronics, so I don't know if is viable to do that. So, can I charger a 3.7 battery with a 5V ...
-1
votes
1answer
66 views

How does this battery charger circuit work?

I am having a hard time figuring out how this circuit works. This is a portion of a circuit which uses AC mains (220 V) to charge a 9 V rechargeable battery. I have added the schematic and the ...
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2answers
108 views

Calculate ampere using volt? [closed]

Can we calculate the output ampere of a battery charger by calculating battery voltage over time: 1. Get volt value name it volt1 2. Wait a second 3. Measure volt again name it volt2 So would the ...
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2answers
37 views

Is the efficiency of (Qi) wireless charging affected by a metal surface?

I recently picked up a Galaxy S7 Edge and love it. I've also gone "all in" on wireless charging, now owning three chargers: a third party standard charger, a third party QC 2.0 (15W) Adaptive Fast ...
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0answers
49 views

Transzorb for MCP73831 USB LiIon Charger?

The datasheet of MCP73831 (a small LiIon charger device) recommends a transzorb on the USB power input (VDD) for input over voltage protection. See Section 6.1.1.2. Absolute maximum ratings for VDD ...
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0answers
22 views

Zener diode in LT3652

I am designing a circuit for a battery charger using the LT3652 chip. The datasheet states that the BOOST pin - BOOST (Pin 11): Bootstrapped Supply Rail for Switch Drive. This pin facilitates ...
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1answer
30 views

Status pin of a charger IC

I am using the LT3652 charger chip,datasheet. Now, there is a status pin /CHRG. The pin is - CHRG (Pin 4): Open-Collector Charger Status Output; typically pulled up through a resistor to a reference ...
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2answers
58 views

What are the dimensions of US outlet holes? [closed]

I am specifically referring to the standard NEMA 5-15 three hole outlet that is used in North America. What are the dimensions of the holes in the outlets? Surprisingly, I am having difficulty in ...
0
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1answer
42 views

How can I build a charger for this RC helicopter? [closed]

I have this remote controlled helicopter: http://www.clasohlson.com/se/Radiostyrd-helikopter/31-8071 Currently it is charged by connecting the remote control. However, since the RC runs on batteries, ...
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1answer
166 views

TP4056 Lithium Charger Module issue

Im having an issue with TP4056 Lithium Charger Module. Connected the battery 3.7v 150mah battery. When charging the red led is on but it never shuts off and no charge state is reached even after 1-2h ...
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votes
2answers
93 views

On an Apple 12W USB Charger, how are the D+ and D- lines configured?

Looking for the voltages on the V+ and V- lines of an Apple 12W charger that corresponds to the 2.4A output.
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1answer
67 views

Can an old SMPS serve as a tablet/cellphone charger [closed]

A computer SMPS is capable of providing stable power supply to multiple devices like hard drive, CD/DVD drive, etc.... Is it possible to convert an old SMPS to power a tablet/cellphone? What ...
1
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1answer
52 views

High-voltage cutoff for battery charger necessary?

I'm trying to build a treadle-powered general purpose USB charger. Internally, the treadle spins a motor which feeds through a diode bridge to charge up a storage battery. The battery then discharges ...
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3answers
167 views

Approval before using built portable charger on a smartphone

I've finally managed to set up a more efficient portable charger that uses 8 AA alkaline batteries(actually not so efficient). Schematic: simulate this circuit – Schematic created using ...
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0answers
68 views

Charge Li-Po battery with TP4056? (Or what else?)

I bought a single cell Li-Po battery and two different charger modules (one without protective circuit and one with protective circuit) from AliExpress. The Li-Po battery has a protection circuit ...
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2answers
86 views

What is the meaning of ripple voltage? and How to calculate a rectifier capacitor?

What is ripple voltage? I think it is the voltage difference of the two red arrows... Is that correct? My second question: If I need to use a voltage regulator LM7805CV. What would be the value ...
5
votes
3answers
2k views

Why some phones need a 5V charger although the battery needs 3.7V only?

I've many mobile (smart phone) chargers. The output of them is 5 volts but the battery needs 3.7v only. Why is it better to make a 5v charger then convert the 5v to 3.7v ? Why don't we just make a ...
0
votes
1answer
82 views

USB to male bullet connector

I'm looking for simplest possible solution to power a load via USB to male bullet connector. Requirements: +5V input voltage 15V output voltage 1,5A output current on the bullet connector very low ...
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1answer
36 views

Wind power charge controller

I have one of these motors that i want to use as a wind turbine generator. http://www.ebay.com/itm/181392138415?_trksid=p2057872.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT I want my setup to be ...
0
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2answers
138 views

Onboard charging system for hybrid electric tractor

I’m in the process of converting a Cub Cadet SLT1554 from gas to a hybrid-electric tractor using a Motenergy ME0909 PMDC Motor. See description/specifications below: Motenergy ME9090 PMDC Motor ...
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votes
1answer
54 views

30-0-30 ACV 8A transformer to 12DCV [closed]

Good Day.. I have a 30ACV 8A transformer. I urgently want to make a 12DCV battery charger from it. What are the components that I should use? Please also help me out with its schematic. Your help ...
0
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2answers
89 views

Boost +12v from ATX PSU to ~13.5-14.5v [closed]

I understand that what I am doing requires the utmost care and that numerous precautions should be taken in completing a project like this. Out of necessity, I am going to fashion a car battery ...
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1answer
72 views

What if i charge a battery with low ampere.? [closed]

Assuming we have a mobile battery and a charger which has less ampere than the original one. Is it damage the battery? if i charge with less ampere charger than the original one. i am asking for just ...
2
votes
1answer
202 views

Questions about Li-ion battery charger and battery monitor chips

I want to build a system powered by 14.8v Li-po battery pack or mains power (selectable power path). When the mains adapter is connected, the battery will be charged and the system will be powered ...
0
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1answer
74 views

LiPo Charging Ciruit - Switching Help

I do understand that similar questions and maybe even the same question has been asked before, I've found them but unfortunately as a result of inexperience on my part I have been unable to adapt the ...
0
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3answers
136 views

Using Super Capacitors with solar cells and batteries to help save my dogs

I am looking to make a dog feeding mechanism that will operate regardless of power outages. The main point of this query initially is to figure out how to work with the materials I have (or can get) ...
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votes
2answers
76 views

What does battery charger's current rating mean? [duplicate]

I am basically a software engineer but have some interest in electronics so this is probably a very basic question. I understand theoretically a battery or power source can provide as much current as ...
0
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2answers
77 views

Bike mobile charger

Hi, I've made a battery operated mobile charger using this circuit. I am able to charge the basic phones (with 2100mAh battery) with it. But the problem is, I couldn't charge any smart phones ...
0
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1answer
46 views

Charging battery

I have a NiCad battery that I got from an old rc car. I have some trouble charging it. the battery is rated 6v and the charger's voltage is rated 7.25 (why is it bigger)? however, I measured the ...
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2answers
96 views

Is this a viable mini wind turbine setup?

I'm going to build my first wind turbine. I have already constructed the prop, 5 blades 50cm long from PVC pipes. I've searched for a decent sized motor and charge controller. The turbine will be ...
1
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0answers
25 views

Charger for my own created battery pack

I am building an RC airplane, for which I have also created a battery pack. What kind of charger do I need to power up the simple line-up of: 6 x AAA, 1.2v, 800mah per battery. (Everything is lined up ...
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1answer
70 views

Lead Acid Battery Voltage rises very quickly

I am working on a charger for the first time. m charging a lead-acid battery (6V) by supplying a voltage of 7-7.2V & 100mA. But the voltage rises from 6.10 to 6.30 in just 5-10 seconds. What ...
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2answers
51 views

difference in charging battery of different Ah

Can i use a lower Ah battery charger(say 20,30)to charge a higher Ah battery ie 110Ah?What are the consequences? What is the difference in the charger circuit in both case?
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1answer
75 views

Is a high current wall charger dangerous for my phone? [closed]

I've bought a USB wall charger to power my Raspberry Pi. I chose the 3A one so that I can connect some more power hungly devices like hard drives to the Pi's USB ports. I can connect 2 cables to the ...
1
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0answers
79 views

Designing a 3 mode smart solar battery charger with MPPT

I'm trying to design a solar charger with MPPT feature that runs in 3 modes (bulk, absorption and float) depending on the state of the battery. The logic is implemented in a fast micro controller and ...
0
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2answers
123 views

How do I calculate the energy (kWh) consumed by my 5V smartphone charger?

I'm having a little trouble in figuring out how much power is absorbed by my 5v smartphone charger. I'm curious as to how to account the energy loss due to stepdown.